Letteratura scientifica selezionata sul tema "EXPENSIVE SOIL"
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Articoli di riviste sul tema "EXPENSIVE SOIL"
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Liu, Jin Hui, Wan Tao Ding e Yu Ping Liu. "Study on Strength Properties of Reinforced Expensive Soils with Failured Material". Applied Mechanics and Materials 99-100 (settembre 2011): 51–54. http://dx.doi.org/10.4028/www.scientific.net/amm.99-100.51.
Testo completoAbstract (sommario):
Based on the tri-axial tests, the stress-strain relationship and strength properties of reinforced expensive soils are studied to get the relation between the strength index of reinforced soil and that of the corresponding plain soil. According to stress-strain relationship of reinforcement soils under different layers and principle of equivalent confining pressure, strength properties of reinforced expensive soils with failure material were analyzed. Mohr circles of different reinforcement layers were tangent to the same line while reinforcement materials fractured. With the increment of axial pressure, different layers were fractured slowly and Mohr circles extended outward. It showed that the strength of reinforcement soils increased with increasing the layers. And the tri-axial tests showed that strength envelopes of reinforcement soils with layers of flexible materials were approximately parallel. The increment of strength was only affected by increment of cohesion.
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Yong, Raymond N., e Abdel Mohsen O. Mohamed. "A study of particle interaction energies in wetting of unsaturated expensive; clays". Canadian Geotechnical Journal 29, n. 6 (1 dicembre 1992): 1060–70. http://dx.doi.org/10.1139/t92-123.
Testo completoAbstract (sommario):
The results of infiltration (wetting) experiments conducted on expansive soils demonstrate several requirements and constraints to the techniques used for the study of wetting performance of such soils. In part, these constraints are a necessary outcome of limitations imposed by the difficulties (impossibility?) of measurement of swelling pressure at the wetting front. To provide a better insight into the development of swelling and reaction pressure in the soil during the wetting process, the energies of interaction between particles and water are examined, especially in regard to those forces developed in the Stern layer. The Grahame modification of the Stern layer has been used in this study to provide the basis for calculations of interaction energies in the inner and outer Helmholtz planes. Comparison with high-pressure consolidation of a sodium montmorillonite at very close particle separation distances suggests that the addition of the energies of interaction developed in the Stern layer to the Gouy–Chapman model would permit the double-layer model to be extended to close particle spacings. Whether this is sufficient to account for the stage I wetting process is a question that remains to be further studied. For the present, the test results suggest that the expression for the total soil–water potential ψ should account for those forces of interaction, thereby providing a better account of the physical processes involved in wetting of the expansive clay and a more realistic diffusion coefficient for the total wetting process. Key words : soil-water potential, osmotic potential, swelling pressure, volume change, wetting front, Stern layer, inner Helmholtz plane, outer Helmholtz plane, Coulombic forces, dipole–dipole interaction, ion–dipole interaction.
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Tan, Bo, Rui Zhang e Yan Ting Lai. "Analysis on Stability of the Expensive Soil Cutting Slope Based on ANSYS". Applied Mechanics and Materials 405-408 (settembre 2013): 299–303. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.299.
Testo completoAbstract (sommario):
Landslide of expansive soil slope is a serious disease and difficult to correct in highway construction. And the mechanism of landslide of expensive soil cutting slope is complex, so the traditional slope analysis method is unable to analyze it to obtain the reasonable explanation. But the numeric analytic method can obtain the stress, strain and plastic zone of side slope analysis the distortion process of earth slope and the latent sliding plane reasonably, adopt the safety factors to evaluate the slope stability, The paper based on ANSYS and adopts the nonlinear and elastoplasticity model of soil, and use the theory of the shear strength reduction method with FEM to analysis the rule of NanYou road expansive soil landslide. Keywords:Expensive soil landslide of cutting slope swelling force FEM
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Maheswari, Anusuri Uma. "Improving Soil Properties by Using Coir". International Journal for Research in Applied Science and Engineering Technology 9, n. VIII (10 agosto 2021): 80–86. http://dx.doi.org/10.22214/ijraset.2021.37280.
Testo completoAbstract (sommario):
Construction on these soils is found to be expensive because of their low bearing strength. Soil having poor bearing need stabilization to make it suitable for construction purpose. In this study coir (extracted from coconut) is used as natural fiber for stabilization of soil. Stabilization using natural fiber is a cost-effective and eco-friendly approach to improve properties of soil. The study is carried out to evaluate the effects of coir fiber on properties of soil. Coconut coir in the soil were varied from 0, 0.5, 1.0, 1.5, and 2.0% and various soil properties were studied.
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Fredlund, D. G., Anqing Xing, M. D. Fredlund e S. L. Barbour. "The relationship of the unsaturated soil shear strength to the soil-water characteristic curve". Canadian Geotechnical Journal 33, n. 3 (2 luglio 1996): 440–48. http://dx.doi.org/10.1139/t96-065.
Testo completoAbstract (sommario):
The measurement of soil parameters, such as the permeability and shear strength functions, used to describe unsaturate soil behaviour can be expensive, difficult, and often impractical to obtain. This paper proposes a model for predicting the shear strength (versus matric suction) function of unsaturated soils. The prediction model uses the soil-water characteristic curve and the shear strength parameters of the saturated soil (i.e., effective cohesion and effective angle of internal friction). Once a reasonable estimate of the soil-water characteristic curve is obtained, satisfactory predictions of the shear strength function can be made for the unsaturated soil. Closed-form solutions for the shear strength function of unsaturated soils are obtained for cases where a simple soil-water characteristic equation is used in the prediction model. Key words: soil suction, soil-water characteristic curve, shear strength function, unsaturated soil.
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Sochacki, Stanley, Peter Ritson e Bruce Brand. "A specialised soil corer for sampling tree roots". Soil Research 45, n. 2 (2007): 111. http://dx.doi.org/10.1071/sr06014.
Testo completoAbstract (sommario):
Sampling and measurement of tree root systems is arduous, expensive, and time-consuming. The lack of adequate and efficient equipment has resulted in the development of a new soil-root sampling apparatus which is able to sample tree roots of any diameter and soils of any hardness. This apparatus is inexpensive, compact, manoeuvrable, and very versatile in application.
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Matua, Vakhtang, e Sergey Karpenko. "Influence of the Stabilizing Additive "ANT" and Soil Stabilizers «LSCS» and «PSCS» for the Strength Characteristics of Highly Dispersed Soils". Materials Science Forum 1043 (18 agosto 2021): 121–25. http://dx.doi.org/10.4028/www.scientific.net/msf.1043.121.
Testo completoAbstract (sommario):
The article deals with the use of local highly dispersed unsuitable soils for the construction of foundations and pavements instead of imported expensive conditioned stone materials. A variant of solving this problem is proposed by strengthening weak (subsiding) soils with modern stabilizing additives and soil stabilizers.
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Ali, Hafiz Rana Muazzam, Ibrahim Khan e Shahan Mehmood Cheema. "MATERIAL MANAGEMENT AND COST-EFFECTIVE PROJECT: TREATMENT OF EXPENSIVE SOIL BY UTILIZATION OF LIME IN PAKISTAN". JUNE 4, n. 2 (29 giugno 2023): 522–32. http://dx.doi.org/10.53664/jsrd/04-02-2023-25-522-532.
Testo completoAbstract (sommario):
The study is conducted to evaluate the material management with respect to cost effectiveness regarding soil utilization of lime project, and the potential applicability of the materials as Pozzallans in Pakistan. Lime (L) was applied to soil at concentrations of 5%, 10%, and 15% based on the soil's dry weight. The study focused on analyzing physical properties & behaviors of untreated and treated soil, specifically emphasizing volume change. After conducting experimental program, we have obtained results for specific gravity, moisture to dry the density ratio, unconfined compressive strength (UCS), and swelling potential. The study's results offer important information wherein the most significant result is that behaviors of swelling & decreasing were significantly improved. Ultimately, it was concluded that using 10% lime solution yielded most significant outcomes. To achieve effectiveness, combining it with porous soils & compact it under light loads is necessary to take under consideration. Finally, it is concluded that the cost may reduce and quality of the project may be enhanced of the project by implementing the project management in pure essence.
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A, Venkatesh, e Sreenivasa Reddy G. "Effect of Terrazyme on CBR and shear strength of expensive soil". MOJ Civil Engineering 4, n. 4 (2018): 245–46. http://dx.doi.org/10.15406/mojce.2018.04.00125.
Testo completo
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Dubey, Neelesh, e Sarvesh Kumar Jain. "Improvement in Soil Sub Grade Using Rice Husk Ash and Silica Fume by Soil Stabilization." International Journal for Research in Applied Science and Engineering Technology 10, n. 12 (31 dicembre 2022): 1200–1213. http://dx.doi.org/10.22214/ijraset.2022.47784.
Testo completoAbstract (sommario):
Abstract: Black cotton soil shows high swelling and shrinkage and less CBR value and strength due to presence of Montmorillonite mineral. Black cotton soil cannot be use for structural purpose in construction industry due to its expensive nature, therefore to control expensive behavior of the soil rise husk ash and silica fume is used in this experimental study. Rise husk ash used 0-15% by weight for observe experiment results and silica fume 0-12% by weight for observation of experiment results. Plasticity index, Free swell index of soil is decreasing with respect to RHA and SF addition and CBR value and shear strength of soil is increasing with respect to addition of RHA and SF . Optimum percentage of rise husk ash (RHA) and Silica fume (SF) observed as 12% and 9% respectively.
Tesi sul tema "EXPENSIVE SOIL"
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RALLI, ROHIT. "COMPARATIVE STUDY OF STABILIZATION OF EXPANSIVE SOIL USING MICROSILICA AND RICE HUSK ASH". Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14924.
Testo completoAbstract (sommario):
The engineering properties of expansive soils may need to be improved to make them suitable for construction using some sort of stabilization methods. Stabilization of pavement subgrade having expansive soils has traditionally relied on treatment with lime, cement, or waste materials such as microsilica. Most transportation agencies, however, are hesitant to specify these non-traditional stabilizers without reliable data to support vendor claims of product effectiveness. The main objective of this study is to investigate the effect of the engineering properties of expansive soils when blended with microsilica and Rice husk ash. Utilizing some of these materials as alternative materials for the construction in no doubt is a best solution. Hence an attempt is made to justify the use of microsilica and RHA for stabilization of expansive soil. This paper highlights the effectiveness of using these materials in the treatment of soil. Laboratory test results presents the influence of different mix proportions of microsilica and rice husk ash on compaction, strength and swelling nature properties of soil.
Libri sul tema "EXPENSIVE SOIL"
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Zhang, L., GR Walker e M. Fleming. Surface Water Balance for Recharge Estimation - Part 9. CSIRO Publishing, 2002. http://dx.doi.org/10.1071/9780643105416.
Testo completoAbstract (sommario):
This addition to The Basics of Recharge and Discharge series deals with the surface water balance approaches that form the traditional basis of hydrological investigations. It explores both field methods and modelling methods for measuring or estimating the different parts of the water balance, including rainfall, evaporation, run-off and soil water storage.
The authors discuss the concepts required to understand a surface water balance result or to set up an experiment. As water balance studies can be both time-consuming and expensive, this report will give readers a better understanding of water balance approaches and the considerations before going into a water balance study for the purpose of deep drainage.
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Marcum, David, e Steven Smith. egonomics: What Makes Ego Our Greatest Asset (or Most Expensive Liability). Fireside, 2008.
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Farriss, Nancy. The Problem of Meaning. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190884109.003.0009.
Testo completoAbstract (sommario):
Missionaries and Indian elites cooperated in translating the gospel message into the indigenous languages. They faced an inevitable trade-off between fidelity to Christian orthodoxy and intelligibility within the alien Mesoamerican culture. The result was either a deficit of meaning for the neophytes or a surplus of meaning created by attaching alien indigenous connotations to the Christian discourse. Zapotec and other indigenous doctrinal texts reveal a range of choices: at one extreme, terms deemed untranslatable, like “God” and “soul,” were imported as loan words; at another extreme, difficult terms were given elaborate explanatory glosses (periphrasis) in the target language, which elucidated meaning but at the expense of economy and fluency of expression.
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Bartholf, J. F. South Florida : The Italy of America; Its Climate, Soil and Productions: How to Get There, Cost of Land, and Expense of Making a Home and Planting a Grove of Fruit Trees; Profits of Farm and Vegetable Culture; Raising of Cattle, Horses, Hogs, And... Creative Media Partners, LLC, 2021.
Cerca il testo completoCapitoli di libri sul tema "EXPENSIVE SOIL"
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Long, Lynn E., Gregory A. Lang e Clive Kaiser. "Planning a new cherry orchard." In Sweet cherries, 86–115. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781786398284.0086.
Testo completoAbstract (sommario):
Abstract Growing fruit trees is a long term financial commitment and establishing an orchard is an expensive enterprise. Selecting the right orchard site is arguably the most important decision that a sweet cherry grower will make and it will affect all other managerial decisions related to the orchard. Choosing the wrong site can affect both fruit yield and quality, and ultimately the financial viability of the operation. On the other hand, choosing a good site will reduce expenses and increase profits. Properly evaluating a prospective orchard location, determining available resources and establishing the orchard takes careful planning. This chapter focuses on important factors in planning a new cherry orchard, including economics and site evaluation (climatic conditions, topography, soil characteristics, soil analysis, water availability and quality, access to key auxilliary facilities, and environmental impact).
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Subbotin, Sergei A. "Phylogenetic analysis of DNA sequence data." In Techniques for work with plant and soil nematodes, 265–82. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781786391759.0265.
Testo completoAbstract (sommario):
Abstract The goal of phylogenetics is to construct relationships that are true representations of the evolutionary history of a group of organisms or genes. The history inferred from phylogenetic analysis is usually depicted as branching in tree-like diagrams or networks. In nematology, phylogenetic studies have been applied to resolve a wide range of questions dealing with improving classifications and testing evolution processes, such as co-evolution, biogeography and many others. There are several main steps involved in a phylogenetic study: (i) selection of ingroup and outgroup taxa for a study; (ii) selection of one or several gene fragments for a study; (iii) sample collection, obtaining PCR products and sequencing of gene fragments; (iv) visualization, editing raw sequence data and sequence assembling; (v) search for sequence similarity in a public database; (vi) making and editing multiple alignment of sequences; (vii) selecting appropriate DNA model for a dataset; (viii) phylogenetic reconstruction using minimum evolution, maximum parsimony, maximum likelihood and Bayesian inference; (ix) visualization of tree files and preparation of tree for a publication; and (x) sequence submission to a public database. Molecular phylogenetic study requires particularly careful planning because it is usually relatively expensive in terms of the cost in reagents and time.
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Subbotin, Sergei A. "Phylogenetic analysis of DNA sequence data." In Techniques for work with plant and soil nematodes, 265–82. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781786391759.0015.
Testo completoAbstract (sommario):
Abstract The goal of phylogenetics is to construct relationships that are true representations of the evolutionary history of a group of organisms or genes. The history inferred from phylogenetic analysis is usually depicted as branching in tree-like diagrams or networks. In nematology, phylogenetic studies have been applied to resolve a wide range of questions dealing with improving classifications and testing evolution processes, such as co-evolution, biogeography and many others. There are several main steps involved in a phylogenetic study: (i) selection of ingroup and outgroup taxa for a study; (ii) selection of one or several gene fragments for a study; (iii) sample collection, obtaining PCR products and sequencing of gene fragments; (iv) visualization, editing raw sequence data and sequence assembling; (v) search for sequence similarity in a public database; (vi) making and editing multiple alignment of sequences; (vii) selecting appropriate DNA model for a dataset; (viii) phylogenetic reconstruction using minimum evolution, maximum parsimony, maximum likelihood and Bayesian inference; (ix) visualization of tree files and preparation of tree for a publication; and (x) sequence submission to a public database. Molecular phylogenetic study requires particularly careful planning because it is usually relatively expensive in terms of the cost in reagents and time.
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Ndayihanzamaso, Privat, Sheryl Bothma, Diane Mostert, George Mahuku e Altus Viljoen. "An Optimised Greenhouse Protocol for Screening Banana Plants for Fusarium Wilt Resistance". In Efficient Screening Techniques to Identify Mutants with TR4 Resistance in Banana, 65–77. Berlin, Heidelberg: Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/978-3-662-64915-2_5.
Testo completoAbstract (sommario):
AbstractFusarium wilt, caused by the soil-borne fungus Fusarium oxysporum f. sp. cubense (Foc), is considered one of the most devastating diseases of banana in the world. Effective management of Fusarium wilt is only achieved by planting banana varieties resistant to Foc. Resistant bananas, however, require many years of breeding and field-testing under multiple geographical conditions. Field evaluation is reliable but time consuming and expensive. Small plant screening methods are, therefore, needed to speed up the evaluation of banana varieties for Foc resistance. To this end, a small plant screening method for resistance to banana Fusarium wilt is presented. The method proposes the planting of 2- to 3-month-old banana plants in soil amended with 10 g Foc-colonised millet seeds. Rhizome discoloration is then evaluated to rank the disease resistance response. The optimized millet seed technique could be useful in mass screening of newly developed genotypes for resistance to Foc.
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Langridge, Peter. "Micronutrient Toxicity and Deficiency". In Wheat Improvement, 433–49. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-90673-3_24.
Testo completoAbstract (sommario):
AbstractMicronutrients are essential for plant growth although required in only very small amounts. There are eight micronutrients needed for healthy growth of wheat: chlorine, iron, boron, manganese, zinc, copper, nickel and molybdenum. Several factors will influence the availability of micronutrients, including levels in the soil, and mobility or availability. Zinc deficiency is the most significant problem globally followed by boron, molybdenum, copper, manganese and iron. Deficiency is usually addressed through application of nutrients to seeds, or through foliar spays when symptoms develop. There is considerable genetic variation in the efficiency of micronutrient uptake in wheat, but this is not a major selection target for breeding programs given the agronomic solutions. However, for some micronutrients, the concentrations in the soil can be very high and result in toxicity. Of the micronutrients, the narrowest range between deficiency and toxicity is for boron and toxicity is a significant problem in some regions. Although not a micronutrient, aluminium toxicity is also a major factor limiting yield in many areas, usually associated with a low soil pH. Agronomic solutions for boron and aluminium toxicity are difficult and expensive. Consequently, genetic approaches have dominated the strategies for addressing toxicity and good sources of tolerance are available.
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Khiabani, Behnam Naserian. "In Vitro Based Mass-Screening Technique for Early Selection of Banana Mutants Resistant to Fusarium Wilt". In Efficient Screening Techniques to Identify Mutants with TR4 Resistance in Banana, 47–63. Berlin, Heidelberg: Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/978-3-662-64915-2_4.
Testo completoAbstract (sommario):
AbstractBanana and plantains are among the most valuable agricultural commodities in the world. Banana Fusarium wilt, caused by the soil-borne Fusarium oxysporum f. sp. cubense (Foc), is one of the most devastating diseases of banana globally. In the 1990s a new strain of Fusarium oxysporum called tropical race 4 (TR4) emerged in Southeast Asia that affected commercial Cavendish plantations. The development of resistant cultivars is an effective strategy for management of the disease. Field-based screening to identify Foc-resistant plants is time-consuming, expensive and is often challenged by variable environmental conditions. Here we present an early selection protocol enabling evaluation of the disease under in vitro conditions. This method provides a preliminary screening and allows evaluation of a large number of in vitro plantlets. Using this method, within a short time and in a small laboratory, breeders can evaluate thousands of banana plantlets, produced via irradiation. Subsequently, putative, disease-resistant mutant lines can be identified and evaluated in the field.
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Nwaogu, Chukwudi. "Improving Food Security by Adapting and Mitigating Climate Change-Induced Crop Pest: The Novelty of Plant-Organic Sludge in Southern Nigeria". In African Handbook of Climate Change Adaptation, 1659–84. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-45106-6_135.
Testo completoAbstract (sommario):
AbstractClimate change is a global issue threatening food security, environmental safety, and human health in tropical and developing countries where people depend mainly on agriculture for their livelihood. Nigeria ranks among the top in the global yam production. It has the largest population in Africa and has been able to secure food for its growing population through food crops especially yam. Unfortunately, the recent increase in termites’ colonies due to climate change threatens yam yield. Besides harming man and environment, pesticides are expensive and not easily accessible to control the pests. This prompted a study which aimed at applying a biotrado-cultural approach in controlling the termites, as well as improving soil chemical properties and yam production. The study hypothesized that Chromolaena odorata and Elaeis guineensis sludge improved soil nutrient and yam yield and consequently decreased termites’ outbreak. In a randomized design experiment of five blocks and five replicates, five different treatments including unmanaged (UM), Vernonia amygdalina (VA), Chromolaena odorata (CO), Elaeis guineensis (EG) liquid sludge, and fipronil (FP) were applied in termites-infested agricultural soil. Data were collected and measured on the responses of soil chemical properties, termites, and yam yield to treatments using one-way ANOVA, regression, and multivariate analyses. The result showed that Chromolaena odorata (CO) and EG treatments were the best treatments for controlling termites and increase yam production. Termites were successfully controlled in VA and FP treatments, but the control was not commensurate with yam production. The experiment needs to be extended to other locations in the study region. It also requires an intensive and long-term investigation in order to thoroughly understand (i) the influence of climate change on the termites’ outbreak, (ii) the extent of termite damage to the crops, (iii) the impacts of climate change and variability on yam yields, (iii) the agricultural and economic benefits of the applied treatments, and (iv) the ecological and human health safety of the treatments.
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Valleggi, Lorenzo, e Federico Mattia Stefanini. "On the utility of treating a vineyard against Plasmopara viticola: a Bayesian analysis". In Proceedings e report, 233–37. Florence: Firenze University Press and Genova University Press, 2023. http://dx.doi.org/10.36253/979-12-215-0106-3.41.
Testo completoAbstract (sommario):
Plasmopara viticola is the causal agent of the downy mildew, the most severe disease of grapevines. In order to prevent and/or mitigate the plant disease, fungicide treatments are often required, despite the presence of side effects on the environment and the potential hazard for human health in case of prolonged exposition. The choice of proper treatments and optimal scheduling is the key to managing downy mildew in an eco-friendly way. Plasmopara viticola’s growth depends on meteorological variables, like temperature and rain, plant’s genotype, the degree of exposition to oospores and soil conditions. Field measurements are expensive both for the high cost of oospore sensors and for the need of meteorological sensors describing the microclimate around each plant. Whatever the amount of information gathered from sensors of a vineyard, a decision must be taken, e.g. according to the predicted probability of infected leaves (and grapes) and considering side effects like the impact of a chemical treatment on the soil and on biodiversity. A multi-attribute utility function on variables describing future consequences of a decision may be defined by following the assumptions of utility independence and preferential independence. The inherent uncertainty is described by a Bayesian prior-predictive distribution where prior are elicited from experts, and eventually updated using available data. The resulting optimal decision is defined as the argument that maximises the expected value of the utility function. The proposed utility function may be tuned to match the individual preference scheme of the winegrower and eventually extended to include further variables like those describing the quality and yield of grapes.
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Fernández de Pinedo, Nadia, Maria Paz Moral e Emiliano Fernández de Pinedo. "Un changement radical dans la consommation de tissus par la royauté et son milieu (1293-1504): de la laine au lin et à la soie". In La moda come motore economico: innovazione di processo e prodotto, nuove strategie commerciali, comportamento dei consumatori / Fashion as an economic engine: process and product innovation, commercial strategies, consumer behavior, 119–45. Florence: Firenze University Press, 2022. http://dx.doi.org/10.36253/978-88-5518-565-3.09.
Testo completoAbstract (sommario):
Since the reign of Juan II and especially Queen Isabel I of Castile, we have found that silk fabrics had displaced expensive dyed wool cloths from the first place, at least among the privileged groups. At the same time, a very fine linen fabric, the holanda spread in a spectacular way, at least in the case of the House of Isabel I, especially as body linen and household line. In this article, we discuss how these changes could be transmitted downwards through some examples of different social groups - nobility, townspeople, peasants - considering the economic and social limitations that would have been relevant in its diffusion.
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Garzilli, Francesca, Federica Vingelli e Valentina Vittiglio. "Shifting Risk into Productivity: Inclusive and Regenerative Approaches Within Compromised Contexts in Peri-Urban Areas". In Regenerative Territories, 51–69. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-78536-9_3.
Testo completoAbstract (sommario):
AbstractRecent international—UN-Habitat and European Environment Agency—and Italian reports have pointed out that urbanization is incessantly expanding at the expense of biodiversity and of rural lands. The radical growth of land consumption and change of land-use contribute to the increase of territorial risks and vulnerability. In particular, such phenomena are more visible within the peri-urban interface, considered as hybrid and malleable areas straddling between city and countryside realities. Even in the absence of a univocal definition, peri-urban is understood as a space where urban expansion occurs. Moreover, it emerges that such space also lacks local governance. Such uncertainty of form, identity and regulation catches the attention of a new urban agenda, which considers the peri-urban the most suitable place where to enact social, ecological and economic challenging changes. In this light, this paper aims to underline how peri-urban areas, although ecologically, socially and weak from a legislation point of view, constitute challenging territories to enact regenerative design and practices. In particular, new policies in sustainable agriculture are considered as potential solutions for the rapid soil consumption in Europe. Therefore, Campania region has been taken as our case study, because the region has a long history of agricultural practices and currently, it is closely linked to risk dynamics. It also represents an emblematic example for its innate exposure to natural hazards (related to its geological nature and geographical location), and for the ongoing man-made risks as causes of ecological and territorial damages. Moreover, land consumption in the region reached a record level in 2019, with 10% of agricultural land lost in a year (corresponding to 140,033 hectares). More than 70% of the consumed lands coincided with areas already exposed to natural hazards, both seismic and hydrogeological (Munafò, 2020). This paper assesses the results of an experimental application developed as part of the REPAiR (This research has been conducted within the framework of the European Horizon 2020 funded research “REPAiR: REsource Management in Peri-urban AReas: Going Beyond Urban Metabolism” [http://h2020repair.eu/]. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 688920. This article reflects only the author’s view. The Commission is not responsible for any use that may be made of the information it contains). Horizon 2020 European research project. We argue that the project results underline the relationship between the peri-urban interface and the soil regeneration through eco-innovative solutions. This has allowed us to link the spatial condition of the peri-urban with the production of waste and its subsequent recycle. This paper aims to further explore the research field experimented during REPAiR, expanding the materials available on the peri-urban and adding information with respect to the risk to which these places are linked.
Atti di convegni sul tema "EXPENSIVE SOIL"
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Zhang, X., Y. Guo, X. Fan e X. Yu. "Analysis on Effect of Expensive Soil Using Polumeric Stabilizing Agents". In MS&T18. MS&T18, 2018. http://dx.doi.org/10.7449/2018mst/2018/mst_2018_1549_1556.
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Zhang, X., Y. Guo, X. Fan e X. Yu. "Analysis on Effect of Expensive Soil Using Polumeric Stabilizing Agents". In MS&T18. MS&T18, 2018. http://dx.doi.org/10.7449/2018/mst_2018_1549_1556.
Testo completo
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El-Gindy, Moustafa, Ryan Lescoe, Fredrik O¨ijer, Inge Johansson e Mukesh Trivedi. "Soil Modeling Using FEA and SPH Techniques for a Tire-Soil Interaction". In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47104.
Testo completoAbstract (sommario):
In recent years, the advancement of computerized modeling has allowed for the creation of extensive pneumatic tire models. These models have been used to determine many tire properties and tire-road interaction parameters which are either prohibitively expensive or unavailable with physical models. More recently, computerized modeling has been used to explore tire-soil interactions. The new parameters created by these interactions were defined for these models, but accurate soil constitutive equations were lacking. With the previous models, the soil was simulated using Finite Element Analysis (FEA). However, the meshless modeling method of Smooth Particle Hydrodynamics (SPH) may be a viable approach to more accurately simulating large soil deformations and complex tire-soil interactions. With both the FEA and SPH soils modeled as elastic-plastic solids, simplified soil tests are conducted. First, pressure-sinkage tests are used to explore the differences in the two soil-modeling methods. From these tests, it is found that the FEA model supports a surface pressure via the tensile forces created by the stretching of the surface elements. Conversely, for the SPH model, the surface pressure is supported via the compressive forces created by the compacting of particles. Next, shear-displacement tests are conducted with the SPH soil (as this test cannot easily be performed with an FEA soil model). These shear tests show that the SPH soil behaves more like clay in initial shearing and more like sand by exhibiting increased shearing due to vertical loading. While both the pressure-sinkage and shear-displacement tests still show that a larger particle density is unnecessary for SPH soil modeling, the shear-displacement tests indicate that an elastic-plastic material model may not be the best choice.
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Jeevanantham, V. "Empirical Modeling on Swell Pressure of Clay using Index Properties". In Sustainable Materials and Smart Practices. Materials Research Forum LLC, 2022. http://dx.doi.org/10.21741/9781644901953-46.
Testo completoAbstract (sommario):
Abstract. Expansive soils undergo volume expansion, when it gains moisture content. Light structures constructed on this type of soil will be lifted by the upward swell pressure. Swelling characteristics decides the degree of safety of structures resting on expansive soil strata. Predicting the swell pressure of the soil consumes nearly 5 days of time (variable with respect to soil potential) in the laboratory as well as needs expensive testing setup. In our study, a correlation is proposed to develop for swell pressure using the index properties of soils namely liquid limit and plastic limit, which shall be assessed at the laboratory relatively short period of time. Swelling Pressure tests by Free Swell Method are performed on dynamically compacted 20 remolded soil samples collected within Coimbatore Corporation limit. The study area is between the four coordinates of 11008'49.25'' N 76053'36.28'' E, 11012’05.58’’ N76055'57.84'' E, 10059'16.52'' N 76052'17.47'' E, 10057'00.59'' N 76057'43.71'' E. Laboratory experimental data given as input in MATLAB gives satisfactory results and correlation is extracted from curve fitting method.
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Rucker, Gregory G. "Estimating Fate and Transport of Multiple Contaminants in the Vadose Zone Using a Multi-Layered Soil Column and Three-Phase Equilibrium Partitioning Model". In The 11th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2007. http://dx.doi.org/10.1115/icem2007-7150.
Testo completoAbstract (sommario):
Soils at waste sites must be evaluated for the potential of residual soil contamination to leach and migrate to the groundwater beneath the disposal area. If migration to the aquifer occurs, contaminants can travel vast distances and pollute drinking water wells, thus exposing human receptors to harmful levels of toxins and carcinogens. To prevent groundwater contamination, a contaminant fate and transport analysis is necessary to assess the migration potential of residual soil contaminants. This type of migration analysis is usually performed using a vadose zone model to account for complex geotechnical and chemical variables including: decay processes, infiltration rate, soil properties, vadose zone thickness, and chemical behavior. The distinct advantage of using a complex model is that less restrictive, but still protective, soil threshold levels may be determined avoiding the unnecessary and costly remediation of marginally contaminated soils. However, the disadvantage of such modeling is the additional cost for data collection and labor required to apply these models. In order to allay these higher costs and to achieve a less restrictive but still protective clean-up level, a multiple contaminant and multi layered soil column equilibrium partitioning model was developed which is faster, simpler and less expensive to use.
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Hejazi, Rasoul, Andrew Grime, Mark Randolph e Mike Efthymiou. "Assessing the Impact of Riser-Soil Interaction Model on the Fatigue Life of Large Diameter SCRs". In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78713.
Testo completoAbstract (sommario):
This paper investigates the effect of riser-soil interaction model selection on the assessment of steel catenary riser (SCR) fatigue life for realistic environmental conditions at a deep-water Australian North west shelf (NWS) site. Using a fatigue wave scatter diagram consisting of 100 metocean conditions at the site (combining irregular seas, swell and current), a dynamic time-domain finite element analysis is coupled with the rain-flow cycle counting algorithm in order to determine the fatigue life of SCRs due to first-order motions of the host floater. Rigid, linear elastic and nonlinear riser-soil interaction models are used in order to assess the impact of model selection on the fatigue life of example deep-water SCRs of varying diameter. It is shown that the use of a nonlinear riser-soil interaction model for a representative deep-water NWS site can give an almost two-fold increase in SCR fatigue life over a stiff linear seabed assumption, albeit at a significant computational expense. It is further shown that a recently developed method for calculating equivalent linear soil stiffness may be used in place of the computationally expensive nonlinear approach in order to estimate SCR fatigue life to a reasonable level of accuracy. A methodology for applying the equivalent linear stiffness method to irregular sea-states is proposed and general insight into the selection of the most appropriate soil-riser interaction model for the fatigue analysis of large diameter deep-water SCRs is provided.
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Zvaigzne, Zaiga Anna, e Aldis Butlers. "Application of fourier-transform infrared spectroscopy for quantification of chemical parameters in peat samples". In 22nd International Scientific Conference Engineering for Rural Development. Latvia University of Life Sciences and Technologies, Faculty of Engineering, 2023. http://dx.doi.org/10.22616/erdev.2023.22.tf097.
Testo completoAbstract (sommario):
The demand for the characterization of soil properties on a wide geographical scale with a high spatial resolution is constantly growing to implement various competitive studies, including climate and ecology studies. However, conventional soil analysis methods are time-consuming and expensive. Fourier-transform infrared spectroscopy (FTIR) has the potential to provide an alternative solution for the rapid and cost-effective determination of soil chemical and physical parameters. In this study, we calibrated a mid-infrared diffuse reflectance Fourier transform spectrometer (MIR-DRIFTS) for the determination of commonly analysed soil parameters such as pH, carbon (C), nitrogen (N), phosphorous (P), calcium (Ca), magnesium (Mg), potassium (K) and humic acid content and evaluated the performance of the elaborated soil analysis MIR-DRIFTS methods. The spectrometer calibration was performed by partial least squares regression analysis using soil spectra data acquired by the spectrometer and soil parameter reference values for the same samples acquired by traditional soil analysis methods. For calibration and validation of the MIR-DRIFTS methods, soil spectra were acquired in 3 replicates for a total of 1891 peat and peaty soils. To evaluate the performance of the elaborated MIR-DRIFTS methods, their uncertainty was evaluated by estimating the precision and accuracy of the results obtained. The highest potential of MIR-DRIFTS performance was observed for the determination of pH, C, N, and humic acid content, with an estimated combined uncertainty ranging around 6%, 6-28%, 16-20%, and 26-50%, respectively, depending on the analyte concentration. The estimated combined uncertainty of Ca, P, Mg, and K concentrations determined by MIR-DRIFTS ranged from 28-49%, 34-37%, 33-57%, and 57-100%, respectively. It was observed that the MIR-DRIFTS method’s performance is highly sensitive to the availability of samples used for method calibration. An increased number and diversity of samples used for calibration can improve the performance of MIR-DRIFTS methods of soil parameter determination.
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Shen, Wenwen, Terry Griffiths, Mengmeng Xu e Jeremy Leggoe. "2D and 3D CFD Investigations of Seabed Shear Stresses Around Subsea Pipelines". In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10626.
Testo completoAbstract (sommario):
For well over a decade it has been widely recognised that existing models and tools for subsea pipeline stability design fail to account for the fact that seabed soils tend to become mobile well before the onset of pipeline instability. Despite ample evidence obtained from both laboratory and field observations that sediment mobility has a key role to play in understanding pipeline/soil interaction, no models have been presented previously which account for the tripartite interaction between the fluid and the pipe, the fluid and the soil, and the pipe and the soil. There are numerous well developed and widely used theories available to model pipe-fluid and pipe-soil interactions. A challenge lies in the way to develop a satisfactory fluid-soil interaction algorithm that has the potential for broad implementation under both ambient and extreme sea conditions due to the complexity of flow in the vicinity of a seabed pipeline or cable. A widely used relationship by Shields [1] links the bedload and suspended sediment transport to the seabed shear stresses. This paper presents details of computational fluid dynamics (CFD) research which has been undertaken to investigate the variation of seabed shear stresses around subsea pipelines as a parametric function of pipeline spanning/embedment, trench configuration and wave/current properties using the commercial RANS-based software ANSYS Fluent. The modelling work has been undertaken for a wide range of seabed geometries, including cases in 3D to evaluate the effects of finite span length, span depth and flow attack angle on shear stresses. These seabed shear stresses have been analysed and used as the basis for predicting sediment transport within the Pipe-Soil-Fluid (PSF) Interaction Model [2] in determining the suspended sediment concentration and the advection velocity in the vicinity of pipelines. The model has significant potential to be of use to operators who struggle with conventional stabilisation techniques for the pipelines, such as those which cross Australia’s North West Shelf, where shallow water depths, highly variable calcareous soils and extreme metocean conditions driven by frequent tropical cyclones result in the requirement for expensive and logistically challenging secondary stabilisation measures.
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Wiens, Travis, Madison Klarkowski e Nima Zahabi. "Development of a Physical Analog Excavator for Studies in Interactions Between Hydraulic Equipment and Human Operators". In BATH/ASME 2020 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/fpmc2020-2771.
Testo completoAbstract (sommario):
Abstract This paper presents a scale model excavator intended to allow for studies on human-machine interactions. In the past, this work has been performed on full-scale equipment which can be dangerous and costly to acquire and operate, or fully in simulation, which requires high precision models of complex effects such as soil forces (e.g. using the Discrete Element Method, DEM, simulating thousands of particles). Also simulation models with scenes projected on computer monitors or in virtual reality may not be realistic enough for the human operator to be fully immersed and behave in a realistic manner. The motion of the small-scale excavator presented here is directed by a digital model of a hydraulic machine given inputs of operator commands and actuator forces, allowing it to mimic the behavior of various hydraulic architectures (e.g. pressure compensated load sensing vs open center vs closed center systems). The excavator is used to dig in physical soils, generating realistic soil-tool interaction forces (which are fed back into the digital machine model) without the need for computationally expensive DEM models. This allows for rapid, low-cost evaluation of various hardware modifications as well as human-machine interaction effects. We also present some preliminary data from a pilot study investigating energy efficiency.
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ADAMONYTĖ, Inga, Vilda GRYBAUSKIENĖ e Gitana VYČIENĖ. "THE INFLUENCE OF BIOLOGICAL ADDITIVES ON THE MOISTURE RETENTION OF SOIL". In RURAL DEVELOPMENT. Aleksandras Stulginskis University, 2018. http://dx.doi.org/10.15544/rd.2017.096.
Testo completoAbstract (sommario):
With the onset of climate change, dry periods are more frequent, and therefore the rational use of naturally accumulating soil moisture can be a tool to regulate the unfavourable soil moisture regime. Demand for new biological materials is increasing rapidly with the development of biotechnological science. Superabsorbent or water retaining material is considered promising material that is widely used in the fields of industry and agriculture. These can both absorb large amounts of water, as much as hundreds of times their own mass. The use of biological environmentally friendly additives to the cultivation of agricultural products, particularly germination and rooting periods, can ensure the required moisture content of the soil. The use of additives is more economical growing relatively more expensive raw materials, so in most cases it is related to vegetable and berry crops. The aim is to investigate the extent to which biological additives can absorb and give back moisture, assessing the different incorporation relations, as well as different biological additives. Soil moisture variation for samples with embedded biological additives ended after 24 and 26 days under laboratory conditions at 17 and 19 °C; it ended after 15 days in an environmental chamber at 20 °C. On average, soil moisture retention increases by 14 days more than the control without additives. The results showed that at low temperatures all the biological additives considered help to keep the moisture available to the plants longer in the soil for approximately the same number of days. In assessing these results, it should be emphasized that the conditions in the nature are different from the simulated critical temperatures and without the addition of moisture, in the natural conditions the impact of biological additives will be longer.
Rapporti di organizzazioni sul tema "EXPENSIVE SOIL"
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Pelletier, Austin, Amanda Hohner, Idil Deniz Akin, Indranil Chowdhury, Richard Watts, Xianming Shi, Brendan Dutmer e James Mueller. Bench-scale Electrochemical Treatment of Co-contaminated Clayey Soil. Illinois Center for Transportation, giugno 2021. http://dx.doi.org/10.36501/0197-9191/21-018.
Testo completoAbstract (sommario):
Industrial soil contamination is frequently unearthed by transportation agencies during construction within the right-of-way. As a result, transportation agencies may experience construction delays. Soils co-contaminated with high-molecular-weight polycyclic aromatic hydrocarbons (HMW-PAHs) and metals are commonly encountered in Illinois and exhibit recalcitrance towards conventional treatment technologies. This issue is exacerbated in the fine-grained soils common to Illinois, where low-permeability and immense sorption capacity increase treatment complexity, cost, and duration. Contaminated sites are spatially and temporally restrictive and require rapid in situ treatments, whereas conventional soil remediation requires 1 to 3 years on average. Consequently, transportation agencies typically pursue excavation and off-site disposal for expediency. However, this solution is expensive, so a comparatively expeditious and affordable treatment alternative is needed to combat the increasing cost of hazardous waste disposal. The objective of this work was to develop an accelerated in situ treatment approach adaptable for use at any construction site to cost-effectively remove HMW-PAHs and metals from clayey soil. It was hypothesized that an in situ electrochemical treatment which augments electrokinetics with H2O2 could remediate both HMW-PAHs and metals in less than a month. Bench-scale reactors resemblant of field-scale in situ electrokinetic systems were designed and fabricated to assess the electrochemical treatment of clayey soils contaminated with HMW-PAHs and metals. Pyrene, chromium, and manganese were used as model contaminants, spiked into kaolinite as a model clay. Electrokinetics were imposed by a low-intensity electrical field distributed by graphite rods. Electrolytic H2O2 systems were leveraged to distribute electrical current and facilitate contaminant removal. Average contaminant removals of 100%, 42.3%, and 4.5% were achieved for pyrene, manganese, and chromium, respectively. Successful development of this bench-scale treatment approach will serve to guide transportation agencies in field-scale implementation. The results from this work signify that electrochemical systems that leverage eco-friendly oxidant addition can replace excavation and disposal as a means of addressing clayey soils co-contaminated with HMW-PAHs and metals.
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Fourie e Tullmin. L51912 Corrosion-CP Monitoring of Locations Remote from a Test Station. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), aprile 2002. http://dx.doi.org/10.55274/r0010624.
Testo completoAbstract (sommario):
It is accepted that many situations exist on pipelines where a significant length of the pipeline (typically 2000 ft to 5 miles) is either totally inaccessible or access is so difficult or expensive that monitoring is not done at the required frequency. The need for finding a technique to allow the corrosion engineer to monitor CP levels of inaccessible locations from an accessible remote location has therefore been identified. A study to investigate all possible techniques available to achieve the above objective and to analyze typical scenarios requiring this approach has therefore been undertaken. Numerous techniques varying from pipe-to-soil type measurements, above ground current attenuation measurements, direct measurement of pipeline current, and measurement of the AC impedance response of the inaccessible section of pipeline were identified. In addition, some novel remote monitoring methods applicable to hostile inaccessible locations were identified. Analysis of these techniques in relation to the problem lead to the development of an algorithm to facilitate the choice of possible techniques under specific conditions.
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Bendikov, Michael, e Thomas C. Harmon. Development of Agricultural Sensors Based on Conductive Polymers. United States Department of Agriculture, agosto 2006. http://dx.doi.org/10.32747/2006.7591738.bard.
Testo completoAbstract (sommario):
In this 1-year feasibility study, we tried polymerization of several different monomers, commercial as well as novel, specially designed and synthesized for this project in the presence of the nitrate ion to produce imprinted conductive polymers. Polymers 1 and 2 (shown below) produced a response to nitrate, but one inferior to that produced by a polypyrrole (Ppy)-based sensor (which we demonstrated prior to this study). Thus, we elected to proceed with improving the stability of the Ppy-based sensor. In order to improve stability of the Ppy-based sensor, we created a two-layer design which includes nitrate-doped Ppy as an inner layer, and nitrate-doped PEDOT as the outer layer. PEDOT is known for its high environmental stability and conductivity. This design has demonstrated promise, but is still undergoing optimization and stability testing. Previously we had failed to create nitrate-doped PEDOT in the absence of a Ppy layer. Nitrate-doped PEDOT should be very promising for sensor applications due to its high stability and exceptional sensing properties as we showed previously for sensing of perchlorate ions (by perchlorate-doped PEDOT). During this year, we have succeeded in preparing nitrate-doped PEDOT (4 below) by designing a new starting monomer (compound 3 below) for polymerization. We are currently testing this design for nitrate sensing. In parallel with the fabrication design studies, we fabricated and tested nitrate-doped Ppy sensors in a series of flow studies under laboratory and field conditions. Nitrate-doped Ppy sensors are less stable than is desirable but provide excellent nitrate sensing characteristics for the short-term experiments focusing on packaging and deployment strategies. The fabricated sensors were successfully interfaced with a commercial battery-powered self-logging (Onset Computer Hobo Datalogger) and a wireless data acquisition and transmission system (Crossbow Technologies MDA300 sensor interface and Mica2 wireless mote). In a series of flow-through experiments with water, the nitrate-doped Ppy sensors were exposed to pulses of dissolved nitrate and compared favorably with an expensive commercial sensor. In 24-hour field tests in both Merced and in Palmdale, CA agricultural soils, the sensors responded to introduced nitrate pulses, but with different dynamics relative to the larger commercial sensors. These experiments are on-going but suggest a form factor (size, shape) effect of the sensor when deployed in a porous medium such as soil. To fill the need for a miniature reference electrode, we identified and tested one commercial version (Cypress Systems, ESA Mini-reference electrode) which works well but is expensive ($190). To create an inexpensive miniature reference electrode, we are exploring the use of AgCl-coated silver wire. This electrode is not a “true” reference electrode; however, it can calibrated once versus a commercial reference electrode at the time of deployment in soil. Thus, only one commercial reference electrode would suffice to support a multiple sensor deployment.
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Brossia. L52119 Comparative Consumption Rates of Impressed Current Cathodic Protection Anodes. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), gennaio 2004. http://dx.doi.org/10.55274/r0010953.
Testo completoAbstract (sommario):
There is a variety of impressed current anode materials available for onshore applications, including High Silicon Cast Iron (HSCI), Mixed Metal Oxides (MMO), graphite, platinum (or platinum coated titanium), and conductive polymers. Many end users simply select the anode material that they have experience with. What is lacking is a clear, direct comparison of relative anode consumption rates conducted under identical conditions. The present study examined the behavior of the various anode types under different current loads and soil conditions in an effort to establish baseline consumption rates under controlled conditions. Variables that were examined included soil resistivity, the presence of coke backfill, current load, and soil type (sand or 50/50 clay/sand mix). The consumption rates of the anodes evaluated decreased in the order of: AnodeFlex, HSCI, Graphite, Pt, and MMO. A survey of field experiences yielded a slightly different order in terms of anode life with Graphite and HSCI lasting the longest. However, given the wide range of anode sizes used in the various field sites, it is difficult to directly link the field results to the consumption rates measured in the laboratory. Soil composition and resistivity were not observed to have a significant influence on anode consumption rates. The presence of coke, however, led to a decrease in consumption for all anodes in some cases by as much as a factor of nearly 70. Utilizing anode cost estimates and neglecting installation costs, the life-cycle material costs for MMO and Pt anodes are much lower than the other anode materials. Furthermore, AnodeFlex was noted to be the highest cost system from a materials perspective. This may be slightly misleading since installation and replacement costs are not factored in. Given that the installation of AnodeFlex is often much easier and less expensive than the other anode types, this may prove to be a viable financial decision when the other factors are considered. ����������� The primary implications of the present study are: Despite higher material costs, MMO and Pt anodes may offer significant long-term cost savings as compared to other anode types for many applications Use of coke backfill is critical to ensure lower anode consumption rates for AnodeFlex, Graphite, and to a lesser extent HSCI; coke does not appear necessary for MMO or Pt Soil composition (sand vs. clay/sand mix) and resistivity do not appear to significantly influence anode consumption rates, thus consideration of the soil environment (except groundwater chemistry) is not needed in selection of an appropriate anode Because the influence of groundwater chemistry (as part of the soil environment) was not examined, the effects of sulfate, chloride, and pH will need to be evaluated in detail to better aid in anode material selection Field use survey responses showed a wide range in observed anode lifespan, with graphite and HSCI experiencing the longest life and cable anodes the shortest The field survey also revealed that a significant cause of anode failures was connector and cable problems
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Yao, Yixin, Mingyuan Fan, Arnaud Heckmann e Corazon Posadas. Transformative Solutions and Green Finance in the People’s Republic of China and Mongolia. Asian Development Bank Institute, novembre 2022. http://dx.doi.org/10.56506/xfvh2542.
Testo completoAbstract (sommario):
Asia has experienced widespread transformation and growth, accompanied by increased demographic pressure, greater intensification of agricultural production, industrialization, and urbanization. This economic growth has been very resource- and carbon-intensive, while climate change has triggered or exacerbated behaviors and defense mechanisms that have come at the expense of the natural environment. Therefore, we examine and compare three Asian Development Bank (ADB) projects in two member countries of the Central Asia Regional Economic Cooperation: one in the People’s Republic of China (PRC) and two in Mongolia that relate to sustainable green development and use innovative financial mechanisms, and behavior-changing nudges. We provide comparative analyses and aim to demonstrate effective, innovative, and sustainable green finance and green transformation approaches in these two countries to address these pressures. The ADB–PRC loan for the Anhui Huangshan Xin’an River Ecological Protection and Green Development project aims to help Huangshan municipality reduce water pollution in the Xin’an River Basin, which is part of the Yangtze River Economic Belt. The project is piloting innovative green financing mechanisms to reduce rural pollution and complement the ongoing interprovincial eco-compensation scheme while supporting green agroecological businesses through two interventions: the Green Investment Fund and the Green Incentive Mechanism. In Mongolia, ADB and the Government of Mongolia have developed two large-scale transformative projects using integrated design and innovative green financing mechanisms to leverage private sector investment: (i) Aimags and Soums Green Regional Development Investment Program, which aims to promote green urban–rural linkages, green agribusiness development, natural capital, rangeland regeneration, and soil carbon sequestration through the (ii) Ulaanbaatar Green Affordable Housing and Resilient Urban Renewal Project, which aims to transform Ulaanbaatar’s vulnerable and substandard peri-urban areas into low-carbon, resilient eco-districts that provide access to green affordable housing.
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L51574 Non-Conventional Means for Monitoring Pipelines in Areas of Soil Subsidence or Soil Movement. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), giugno 1988. http://dx.doi.org/10.55274/r0010329.
Testo completoAbstract (sommario):
Examines non-conventional techniques for monitoring curvatures, displacement, or strains in buried pipelines. Internal devices, external devices, and fiber optic techniques were examined. Feasibility of each system is discussed and the most promising are identified. Two companion studies 'Guidelines Pipeline Strain Monitoring by Conventional Means' (Reference 1) and 'A Proposed Model for the Intervention Decision Making Process in Pipeline Movement Situations' (Reference 2) have already been completed, and an effort to determine appropriate failure criteria for pipelines in areas of soil instability is currently underway. The objective of this study is to describe methods of pipeline monitoring which are, for the most part, still in the conceptual and/or development phases. It is very likely that the techniques described herein will require extensive validation efforts and significant financial support before they will become reliable tools for routine use Improved pipeline strain monitoring techniques are needed because the conventional techniques (strain gages, inclinometers, and topographical surveying) meet all of the industry's needs. The conventional techniques are expensive, labor intensive, and require access to the pipeline for installation . As such they are limited in use to localized trouble spots that are known to be a problem. None of these techniques could be practically applied to a whole pipeline for any-time monitoring. Techniques that will better satisfy the industry's needs must be adequately sensitive, applicable to the whole pipeline, available at all times (or at least at reasonably frequent intervals), and capable of use without the need to excavate the pipeline or to interfere with its operation.Several non-conventional techniques for monitoring curvatures, displacements, or strains in buried pipelines that may meet these requirements are discussed herein. These fall into three generic classes: internal devices (instrumented pigs), external devices (involving moving a detecting device over the pipeline right-of-way), fiber-optic cables attached to the pipeline over its entire length.